How do I show the date field as MM/dd/yyyy in flexmonster pivot table?

How do I show the date field as MM/dd/yyyy in flexmonster pivot table?  I keep getting the FLIGHT_DATE to show as a date hierarchy (FLIGHT_DATE.Day, FLIGHT_DATE.Month, FLIGHT_DATE.Year).
Here's a line in my JSON data for FLIGHT_DATE: {[FLIGHT_DATE, 02/03/2016]}
var reportQ3 = {
dataSourceType: "json",
data: jsonData2,
rows: [{
uniqueName: "POS_LEVEL5_CD",
hierarchy: "Geography",
type: "level",
parent: "Airline",
caption: "Continent"
}, {
uniqueName: "POS_LEVEL4_CD",
hierarchy: "Geography",
type: "level",
parent: "Continent",
caption: "Country"
}],
columns: [
{ uniqueName: "OPERATING_AIRLINE", caption: "Airline", type: "string", active: true },
{ uniqueName: "FLIGHT_DATE", caption: "Flight Date", type: "string", active: true },
{ uniqueName: "[Measures]", active: true }
]
}